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Co-operative multitasking utility

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package com.github.akurilov.fiber4j;

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * The base class for a fiber implementation which may not be executed in parallel.
 */
public abstract class ExclusiveFiberBase
extends FiberBase {

	private final Lock invocationLock;

	protected ExclusiveFiberBase(final FibersExecutor executor) {
		this(executor, new ReentrantLock());
	}

	protected ExclusiveFiberBase(final FibersExecutor executor, final Lock invocationLock) {
		super(executor);
		this.invocationLock = invocationLock;
	}

	@Override
	protected final void invokeTimed(final long startTimeNanos) {
		if(invocationLock.tryLock()) {
			try {
				invokeTimedExclusively(startTimeNanos);
			} finally {
				invocationLock.unlock();
			}
		}
	}

	/**
	 * The method is guaranteed to be executing only in a single thread.
	 * @param startTimeNanos the time when the invocation started
	 */
	protected abstract void invokeTimedExclusively(final long startTimeNanos);
}